Smoke banding in render
You can try the Cubic volume interpolation method and Distance sampling. Settings supported on CPU only:


Distance sampling: Best for dense volumes with lights far away.
Cubic: Smoothed high quality interpolation, but slower.

Linear vs Cubic:

GPU support for Cubic interpolation is added in 2.8 version:

Commit 2d92988f6bc4 &amp; f61c340bc15e: CUDA and OpenCL rendering support for cubic interpolation with images and volumes.